BAHAHAHAAHHAH oh mY GODOD i've been waiting for a question like this😍😍 initially when they first met, Ada found Lea kinda hot... like appearance wise (who wouldn't want a 6'5 fit blonde chick who looked like she hadn't slept in a year🦭) and then it was bc of how Lea reacts to Ada's teasing and flirting, with them running into each other again n again it only made Ada to be even more interested in Lea. At one point Lea did even make a move out of sheer annoyance... like she be slamming that girl to a wall and make out or somethin... liek she wants that girl deck so bad,,,.... SO YEAHH that's how Ada start liking her baka dog waife, later on the feeling would be more solid(?) when they got more serious 🦭